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Determination of water uptake in organic coatings deposited on 2024 aluminium alloy: Comparison between impedance measurements and gravimetry

Nguyen, Anh Son and Caussé, Nicolas and Musiani, Marco and Orazem, Mark E. and Pébère, Nadine and Tribollet, Bernard and Vivier, Vincent Determination of water uptake in organic coatings deposited on 2024 aluminium alloy: Comparison between impedance measurements and gravimetry. (2017) Progress in Organic Coatings, 112. 93-100. ISSN 0300-9440

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Official URL: https://dx.doi.org/10.1016/j.porgcoat.2017.07.004

Abstract

Electrochemical impedance spectroscopy (EIS) and gravimetric measurements on two water-based coatings, containing either SrCrO4 or a mixture of Cr(VI)-free pigments and deposited on 2024 aluminium alloy, were performed to follow the water uptake in a 0.5 M NaCl solution as a function of exposure time. To account for the observed non-ideal capacitive behaviour, the coating capacitance and dielectric constant values were extracted from the EIS data in two ways: (i) by using a complex-capacitance representation and (ii) by fitting to the EIS data a model that assumed an exponential distribution of coating resistivity. The agreement of values obtained by these independent methods served to validate the model used to account for the observed pseudo constant-phase-element (CPE) behaviour of the coatings. The water uptake calculated from dielectric constant values, employing a linear combination formula, was in good agreement with that directly measured by gravimetry, using supported-films.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The original PDF of the article can be found at Progress in Organic Coatings website : https://www.sciencedirect.com/science/article/pii/S0300944017302990?via%3Dihub
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Consiglio Nazionale delle Ricerche - CNR (ITALY)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Other partners > Université Pierre et Marie Curie, Paris 6 - UPMC (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > University of Florida (USA)
Other partners > Vietnam Academy of Science and Technology - VAST (VIETNAM)
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Deposited By: cirimat webmestre
Deposited On:16 Apr 2018 08:23

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